CANADA STOCKS-TSX steady as geopolitical fears offset Talisman, WestJet gains

* TSX up 1.33 points, or 0.01 percent, and 15,446.55 * Seven of the 10 main index sectors advance * WestJet jumps 3.9 percent after quarterly report By John Tilak TORONTO, July 29 (Reuters) - Canada's main stock index ended little changed on Tuesday as concerns about geopolitical tensions helped offset gains in Talisman Energy Inc and WestJet Airlines Ltd after the companies reported quarterly results. Investors digested news of a fresh wave of violence in the Middle East, a